Rigol DP900 Series Operating instructions

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Section Description Page
List of Tables................................................................................................................................VI
1 Document Overview...................................................................................................................1
2 SCPI Introduction.........................................................................................................................3
3 SCPI Status Register....................................................................................................................6
3.1 Questionable Status Register...........................................................................................8
3.2 Standard Event Register...................................................................................................11
3.3 Status Byte Register.......................................................................................................... 12
4 Command System..................................................................................................................... 13
4.1 :ANALyzer Commands......................................................................................................13
4.1.1 :ANALyzer:COMMon:MEASure:TYPE...................................................................13
4.1.2 :ANALyzer:CURRent:MEASure:TYPE.................................................................... 14
4.1.3 :ANALyzer:CURRent:THRE.......................................................................................14
4.1.4 :ANALyzer:SAVE:ROUTe........................................................................................... 15
4.1.5 :ANALyzer:SAVE:STATe............................................................................................. 16
4.1.6 :ANALyzer:STATe.........................................................................................................17
4.1.7 :ANALyzer:TYPE..........................................................................................................18
4.2 :APPLy Commands.............................................................................................................18
4.2.1 :APPLy............................................................................................................................ 19
4.3 IEEE488.2 Commands.......................................................................................................20
4.3.1 *CLS................................................................................................................................ 20
4.3.2 *ESR?..............................................................................................................................21
4.3.3 *ESE.................................................................................................................................22
4.3.4 *IDN?..............................................................................................................................23
4.3.5 *OPC...............................................................................................................................23
4.3.6 *OPT?............................................................................................................................. 24
4.3.7 *PSC................................................................................................................................25
4.3.8 *RCL................................................................................................................................26
4.3.9 *RST................................................................................................................................27
4.3.10 *SAV................................................................................................................................27
4.3.11 *SRE................................................................................................................................28
4.3.12 *STB?..............................................................................................................................29
4.3.13 *TRG............................................................................................................................... 30
4.3.14 *TST?.............................................................................................................................. 30
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4.3.15 *WAI............................................................................................................................... 31
4.4 :INSTrument Commands................................................................................................. 31
4.4.1 :INSTrument:NSELect................................................................................................31
4.4.2 :INSTrument[:SELect]................................................................................................ 32
4.4.3 :INSTrument[:SELEct]................................................................................................ 33
4.5 :LIC Commands...................................................................................................................33
4.5.1 :LIC:SET.......................................................................................................................... 33
4.5.2 :LIC:INSTall....................................................................................................................34
4.6 :MEASure Commands.......................................................................................................35
4.6.1 :MEASure[:SCALar]:ALL[:DC]?.................................................................................36
4.6.2 :MEASure[:SCALar]:CURRent[:DC]?...................................................................... 36
4.6.3 :MEASure[:SCALar]:POWEr[:DC]?..........................................................................37
4.6.4 :MEASure[:SCALar][:VOLTage][:DC]?....................................................................38
4.7 :MEMory Commands........................................................................................................39
4.7.1 :MEMory:CATalog?.................................................................................................... 39
4.7.2 :MEMory:CDIRectory................................................................................................40
4.7.3 :MEMory:DELete.........................................................................................................40
4.7.4 :MEMory:DISK?...........................................................................................................41
4.7.5 :MEMory:LOAD...........................................................................................................42
4.7.6 :MEMory:LOCK............................................................................................................42
4.7.7 :MEMory:MDIRectory...............................................................................................43
4.7.8 :MEMory:STORe..........................................................................................................44
4.7.9 :MEMory:VALid?.........................................................................................................45
4.8 :OUTPut Commands......................................................................................................... 45
4.8.1 :OUTPut:CVCC?...........................................................................................................46
4.8.2 :OUTPut:MODE?.........................................................................................................46
4.8.3 :OUTPut:OCP:ALAR?................................................................................................. 47
4.8.4 :OUTPut:OCP:QUES?.................................................................................................48
4.8.5 :OUTPut:OCP:CLEar...................................................................................................49
4.8.6 :OUTPut:OCP:DELay..................................................................................................49
4.8.7 :OUTPut:OCP[:STATe]................................................................................................50
4.8.8 :OUTPut:OCP:VALue..................................................................................................51
4.8.9 :OUTPut:OVP:ALAR?................................................................................................. 52
4.8.10 :OUTPut:OVP:QUES?.................................................................................................52
4.8.11 :OUTPut:OVP:CLEar...................................................................................................53
4.8.12 :OUTPut:OVP[:STATe]................................................................................................54
4.8.13 :OUTPut:OVP:VALue..................................................................................................55
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4.8.14 :OUTPut:PAIR...............................................................................................................56
4.8.15 :OUTPut[:STATe]..........................................................................................................56
4.8.16 :OUTPut:TRACk[:STATe]............................................................................................57
4.9 :SOURce Commands.........................................................................................................58
4.9.1 [:SOURce[<n>]]:CURRent[:LEVel][:IMMediate][:AMPLitude]...................... 58
4.9.2 [:SOURce[<n>]]:CURRent[:LEVel]
[:IMMediate]:STEP[:INCRement]
..........................59
4.9.3 [:SOURce[<n>]]:CURRent:PROTection:CLEar....................................................60
4.9.4 [:SOURce[<n>]]:CURRent:PROTection[:LEVel]..................................................61
4.9.5 [:SOURce[<n>]]:CURRent:PROTection:STATe....................................................62
4.9.6 [:SOURce[<n>]]:CURRent:PROTection:TRIPped?............................................ 63
4.9.7 [:SOURce[<n>]]:VOLTage[:LEVel][:IMMediate][:AMPLitude].......................64
4.9.8 [:SOURce[<n>]]:VOLTage[:LEVel]
[:IMMediate]:STEP[:INCRement]
..........................65
4.9.9 [:SOURce[<n>]]:VOLTage:PROTection:CLEar.................................................... 66
4.9.10 [:SOURce[<n>]]:VOLTage:PROTection[:LEVel].................................................. 67
4.9.11 [:SOURce[<n>]]:VOLTage:PROTection:STATe....................................................68
4.9.12 [:SOURce[<n>]]:VOLTage:PROTection:TRIPped?.............................................69
4.10 :STATus Commands........................................................................................................... 69
4.10.1 :STATus:OPERation:CONDition?............................................................................ 70
4.10.2 :STATus:OPERation:ENABle..................................................................................... 70
4.10.3 :STATus:OPERation[:EVENt]?...................................................................................71
4.10.4 :STATus:PRESet............................................................................................................71
4.10.5 :STATus:QUEStionable:ENABle...............................................................................72
4.10.6 :STATus:QUEStionable[:EVENt]?.............................................................................73
4.10.7 :STATus:QUEStionable:INSTrument:ENABle.......................................................73
4.10.8 :STATus:QUEStionable:INSTrument[:EVENt]?....................................................74
4.10.9 :STATus:QUEStionable:INSTrument:ISUMmary[<n>]:CONDition?............ 75
4.10.10 :STATus:QUEStionable:INSTrument:ISUMmary[<n>]:ENABle.....................76
4.10.11 :STATus:QUEStionable:INSTrument:ISUMmary[<n>][:EVENt]?...................77
4.11 :SYSTem Commands......................................................................................................... 78
4.11.1 :SYSTem:BEEPer:IMMediate....................................................................................78
4.11.2 :SYSTem:BEEPer[:STATe]........................................................................................... 78
4.11.3 :SYSTem:BRIGhtness..................................................................................................79
4.11.4 :SYSTem:COMMunicate:LAN..................................................................................79
4.11.4.1 :SYSTem:COMMunicate:LAN:APPLy............................................................ 80
4.11.4.2 :SYSTem:COMMunicate:LAN:AUTOip[:STATe]..........................................80
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4.11.4.3 :SYSTem:COMMunicate:LAN:DHCP[:STATe]..............................................81
4.11.4.4 :SYSTem:COMMunicate:LAN:DNS................................................................82
4.11.4.5 :SYSTem:COMMunicate:LAN:IPADdress.....................................................83
4.11.4.6 :SYSTem:COMMunicate:LAN:GATEway...................................................... 84
4.11.4.7 :SYSTem:COMMunicate:LAN:MAC?.............................................................84
4.11.4.8 :SYSTem:COMMunicate:LAN:MANualip[:STATe]..................................... 85
4.11.4.9 :SYSTem:COMMunicate:LAN:SMASk.......................................................... 86
4.11.5 :SYSTem:COMMunicate:RLSTate...........................................................................87
4.11.6 :SYSTem:ERRor[:NEXT]?............................................................................................88
4.11.7 :SYSTem:KLOCk:STATe...............................................................................................88
4.11.8 :SYSTem:LANGuage:TYPE........................................................................................89
4.11.9 :SYSTem:LOCal.............................................................................................................90
4.11.10 :SYSTem:POWEron.....................................................................................................90
4.11.11 :SYSTem:PRINt?...........................................................................................................91
4.11.12 :SYSTem:REMote........................................................................................................ 91
4.11.13 :SYSTem:RWLock........................................................................................................92
4.11.14 :SYSTem:SAVer.............................................................................................................93
4.11.15 :SYSTem:SYNC[:STATe]..............................................................................................93
4.11.16 :SYSTem:TMODe.........................................................................................................94
4.11.17 :SYSTem:TLOCk........................................................................................................... 95
4.11.18 :SYSTem:VERSion?......................................................................................................96
4.12 :TIMEr Commands............................................................................................................. 96
4.12.1 :TIMEr:CYCLEs............................................................................................................. 96
4.12.2 :TIMEr:CHANNel.........................................................................................................97
4.12.3 :TIMEr:ENDState.........................................................................................................98
4.12.4 :TIMEr:GROUPs:NUM?............................................................................................. 98
4.12.5 TIMEr:GROUP:INDEx.................................................................................................99
4.12.6 :TIMEr:GROUP:PARAmeter...................................................................................100
4.12.7 :TIMEr:GROUP:DELete............................................................................................101
4.12.8 :TIMEr:RUN................................................................................................................102
4.12.9 :TIMEr[:STATe]........................................................................................................... 102
4.12.10 :TIMEr:TEMPlet:CONSTruct.................................................................................. 103
4.12.11 :TIMEr:TEMPlet:FALLRate......................................................................................104
4.12.12 :TIMEr:TEMPlet:INTErval........................................................................................104
4.12.13 :TIMEr:TEMPlet:INVErt...........................................................................................105
4.12.14 :TIMEr:TEMPlet:MAXValue....................................................................................106
4.12.15 :TIMEr:TEMPlet:MINValue.....................................................................................107
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4.12.16 :TIMEr:TEMPlet:OBJect.......................................................................................... 108
4.12.17 :TIMEr:TEMPlet:PERIod..........................................................................................109
4.12.18 :TIMEr:TEMPlet:POINTs..........................................................................................109
4.12.19 :TIMEr:TEMPlet:RISERate.......................................................................................110
4.12.20 :TIMEr:TEMPlet:SELect........................................................................................... 111
4.12.21 :TIMEr:TEMPlet:SYMMetry...................................................................................112
4.12.22 :TIMEr:TEMPlet:WIDTh...........................................................................................112
4.12.23 :TIMEr:TEMPlet:STAIr..............................................................................................113
4.12.24 :TIMEr:TRIG................................................................................................................114
4.13 :TRIGger Commands...................................................................................................... 114
4.13.1 :TRIGger:IN[:ENABle]..............................................................................................115
4.13.2 :TRIGger:IN:IMMEdiate..........................................................................................115
4.13.3 :TRIGger:IN:RESPonse............................................................................................116
4.13.4 :TRIGger:IN:SOURce............................................................................................... 117
4.13.5 :TRIGger:IN:TYPE..................................................................................................... 117
4.13.6 :TRIGger:OUT:POLArity......................................................................................... 118
4.13.7 :TRIGger:OUT:SOURce........................................................................................... 119
4.13.8 :TRIGger:OUT[:ENABle]..........................................................................................120
5 Programming Examples........................................................................................................121
5.1 Programming Preparations..........................................................................................121
5.2 LabVIEW Programming Example...............................................................................121
5.3 Visual Basic Programming Example..........................................................................126
5.4 VisualC++ Programming Example............................................................................128
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List of Tables
Table 3.1 Definitions of the bits in the questionable status register and the
decimal values corresponding to their binary weights ............................................9
Table 3.2 Definitions of the bits in the channel questionable status register and
the decimal values corresponding to their binary weights ..................................10
Table 3.3 Definitions of the bits in the channel questionable status SUMMARY
register and the decimal values corresponding to their binary weights .........10
Table 3.4 Definitions of the bits in the standard event register and the decimal
values corresponding to their binary weights ..........................................................11
Table 3.5 Definitions of the bits in the status byte register and the decimal
values corresponding to their binary weights ..........................................................12
Table 4.9 Ranges and default values of voltage/current corresponding to each
channel of different models of DP900 series ............................................................18
Table 4.33 Range and default value of overvoltage/overcurrent protection ......45
VI Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.

1Document Overview
This manual is your guide to control DP900 series power supply by sending SCPI
commands via remote interface. DP900 series can communicate with the PC via the
USB or LAN interface.
TIP
For the latest version of this manual, download it from the official website of RIGOL ( http://
www.rigol.com ).
Publication Number
PGH08100-1110
Software Version
00.00.01
Software upgrade might change or add product features. Please acquire the latest
version of the manual from RIGOL website or contact RIGOL to upgrade the software.
Format Conventions in this Manual
1. Key
The front-panel key is denoted by the menu key icon. For example, the
indicates the “Utility” shortcut key.
2. Menu
The menu function key is denoted by the format of "Menu Name (Bold) +
Character Shading" in the manual. For example, System indicates the “System”
menu option in the operation interface. Tap System to access the “System”
function menu.
3. Operation Procedures
The “>” denotes the next step of the operation. For example, >Store
indicates first tapping , and then tapping Store.
Content Conventions in this Manual
The following DP900 series power supply models are available. Unless otherwise
specified, this manual takes DP932A as an example to illustrate the functions and
operation methods of DP900 series power supply.
Document Overview
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Model Number of
Channels Output Voltage/Current
DP932A 3 32 V/3 A, 32 V/3 A, 6 V/3 A
DP932U 3 32 V/3 A, 32 V/3 A, 6 V/3 A
DP932E 3 30 V/3 A, 30 V/3 A, 6 V/3 A
Document Overview
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2SCPI Introduction
SCPI (Standard Commands for Programmable Instruments) is a standardized
instrument programming language that is built upon the existing standard IEEE 488.1
and IEEE 488.2 and conforms to various standards, such as the floating point
operation rule in IEEE 754 standard, ISO 646 7-bit coded character set for information
interchange (equivalent to ASCII programming). The SCPI commands provide a
hierarchical tree structure, and consist of multiple subsystems. Each command
subsystem consists of one root keyword and one or more sub-keywords.
Syntax
The command line usually starts with a colon; the keywords are separated by colons,
and following the keywords are the parameter settings available. The command
ending with a quotation mark indicates querying a certain function and returns the
query results. The keywords of the command and the first parameter are separated by
a space.
For example,
:ANALyzer:TYPE <
type >
:ANALyzer:TYPE?
ANALyzer is the root keyword of the command, TYPE is the second-level keyword.
The command line starts with a colon, and different levels of keywords are also
separated by colons. <
type > indicates a settable parameter. The command ending
with a quotation mark indicates querying a function. The command
keywords :ANALyzer:TYPE and the parameter < type > are separated by a space.
In some commands with parameters, "," is often used to separate multiple
parameters. For example,
:TRIGger:IN:TYPE < d >,< type >
Symbol Description
The following symbols are not sent with the commands.
1. Braces { }
The contents in the braces can contain one or multiple parameters. These
parameters can be omitted or used for several times. Parameters are usually
separated by the vertical bar "|". When using the command, you must select one of
the parameters.
2. Vertical Bar |
The vertical bar is used to separate multiple parameters. When using the
command, you must select one of the parameters.
3. Square Brackets [ ]
SCPI Introduction
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The contents in the square brackets can be omitted.
4. Angle Brackets < >
The parameter enclosed in the angle brackets must be replaced by an effective
value.
Parameter Type
1. Bool
The parameter can be set to ON, OFF, 1, or 0. For example,
:SYSTem:BEEPer < bool >
:SYSTem:BEEPer?
Wherein, < bool > can be set to {{1|ON}|{0|OFF}}. The query returns 1 or 0.
2. Discrete
The parameter can be any of the values listed. For example,
:ANALyzer:TYPE < type >
:ANALyzer:TYPE?
Wherein,
-<
type > can be set to COM|CURR.
-The query returns COM or CURR.
3. Integer
Unless otherwise specified, the parameter can be any integer (NR1 format) within
the effective value range.
CAUTION
Do not set the parameter to a decimal, otherwise, errors will occur.
For example,
:TIMEr:GROUP:INDEx < val >
:TIMEr:GROUP:INDEx?
Wherein, < val > can be set to an integer ranging from 1 to 512. The query returns
an integer ranging from 1 to 512.
4. Real
The parameter can be any real number within the effective value range, and this
command accepts parameter input in decimal (NR2 format) and scientific notation
(NR3 format). For example,
:TIMEr:TEMPlet:INTErval <
time >
SCPI Introduction
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:TIMEr:TEMPlet:INTErval?
Wherein, < time > can be set to any real number ranging from 0.1 (0.1 s) to 3600
(3600 s). The query returns a real number in floating point format.
5. ASCII String
The parameter can be the combinations of ASCII characters. For example,
:MEMory:DELete <
filename >
Wherein, <
filename > can be set to NEW.RSF.
Command Abbreviation
All the commands are case-insensitive. They can all be in upper case or in lower case.
If abbreviation is used, you must input all the capital letters in the command. For
example,
:STSTem:BRIGhtness?
can be abbreviated as
:STST:BRIG?
SCPI Introduction
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3SCPI Status Register
All SCPI instruments implement status registers in the same way. The status system
records various instrument conditions in three register groups: the Status Byte
register, the Standard Event register, and the Questionable Status register groups. The
Status Byte register records high-level summary information reported in other
register groups. The figure below illustrates the SCPI status system.
Event Register
An event register is a read-only register that reports defined status within the power
supply. Bits in an event register are latched. Once an event bit is set, subsequent state
(event state represented by this bit) changes are ignored. Bits in an event register are
automatically cleared by a query of the event register (such as
*ESR?
or :STATus:QUEStionable[:EVENt]? ) or by sending the clear status command ( *CLS ).
The reset command *RST will not clear bits in event registers. Querying an event
SCPI Status Register
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register returns a decimal value of the binary-weighted sum of all bits set in the
register.
Enable Register
An enable register is both readable and writable, used to define which status
information will be reported to the next level. Querying an enable register will not
clear bits in it. Sending the clear status command
*CLS will not clear bits in the enable
register (but the command *CLS does clear the bits in the event registers). To enable
bits in an enable register, you must write a decimal value which corresponds to the
binary-weighted sum of the bits you wish to enable in the register.
Multiple Logical Output
It is only applicable to multi-channel models. Take DP932A as an example. The three
logical outputs of the power supply include a channel questionable status register
and three independent channel questionable status SUMMARY registers
(corresponding to the logical outputs of the three channels respectively). The channel
questionable status SUMMARY registers report the status of each channel to the
channel questionable status register, which in turn reports the channel status to bit13
(ISUM bit) of the Questionable status register.
SCPI Status Register
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3.1 Questionable Status Register
The channel questionable status register indicates the channel in which a
questionable event occurs. Yet for each specific logical output, the channel
questionable status SUMMARY register is a pseudo-questionable status register.
The questionable status register provides information about questionable status of
the power supply. bit4 (TEMPerature) reports the over-temperature state; bit11 (FAN)
reports the fan failure state and bit13 (INSTrument summary) summaries the
questionable output state of any of the three output channels.
Sending
:STATus:QUEStionable[:EVENt]? will read the register. To use bit13, you must
SCPI Status Register
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enable the registers that you wish to summarize with bit13.
Send :STATus:QUEStionable:INSTrument:ENABle to enable the channel questionable
status register. Then send :STATus:QUEStionable:INSTrument:ISUMmary[<n>]:ENABle
to enable the corresponding channel questionable status SUMMARY register. The
definitions of the bits in the questionable status register of multi-channel models and
the decimal values corresponding to their binary weights are as shown in the table
below.
Table 3.1 Definitions of the bits in the questionable status register and the
decimal values corresponding to their binary weights
Bit Decimal Value Definition
0-3 Not used 0 Always be 0.
4 TEMPerature 16 Over-temperature
5-10 Not used 0 Always be 0.
11 FAN 2048 Fan failure.
12 Not used 0 Always be 0.
13 INSTrument
summary 8192
Summary information of
the channel questionable
status register and channel
questionable status
SUMMARY register group.
14-15 Not used 0 Always be 0.
Channel Questionable Status Register
The channel questionable status register provides information about questionable
status of any of the three output channels. bit1 (INST1 event summary), bit2 (INST2
event summary), and bit3 (INST3 event summary) report the information about the
questionable states of CH1, CH2, and CH3 respectively.
Sending
:STATus:QUEStionable:INSTrument[:EVENt]? will read the register. To use the
channel questionable status register, you must enable the channel questionable
status SUMMARY register.
You can send
:STATus:QUEStionable:INSTrument:ISUMmary[<n>]:ENABle to enable
channel questionable status SUMMARY register. The definitions of the bits in the
channel questionable status SUMMARY register and the decimal values
corresponding to their binary weights are as shown in the table below.
SCPI Status Register
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Table 3.2 Definitions of the bits in the channel questionable status register and
the decimal values corresponding to their binary weights
Bit Decimal Value Definition
0 Not used 0 Always be 0.
1INST1 event
summary 2Summary information of CH1 events.
2INST2 event
summary 4Summary information of CH2 events.
3INST3 event
summary 8Summary information of CH3 events.
4-15 Not used 0 Always be 0.
Channel Questionable Status SUMMARY Register
There are three channel questionable status Summary registers, one for each channel.
These registers provide information about voltage and current regulation as well as
overvoltage and overcurrent. bit0 (VOLTage) is set when the voltage becomes
unregulated, and bit1 (CURRent) is set when the current becomes unregulated.
Sending
:STATus:QUEStionable:INSTrument:ISUMmary[<n>][:EVENt]? will read the
channel questionable status SUMMARY register of the corresponding channel. The
definitions of the bits in the channel questionable status SUMMARY register and the
decimal values corresponding to their binary weights are as shown in the table below.
Table 3.3 Definitions of the bits in the channel questionable status SUMMARY
register and the decimal values corresponding to their binary weights
Bit Decimal Value Definition
0 VOLTage 1
The power supply is
operating in constant
current mode and the
voltage is unregulated.
1 CURRent 2
The power supply is
operating in constant
voltage mode and the
current is unregulated.
2 OVP 4 Overvoltage protection
occurs.
3 OCP 8 Overcurrent protection
occurs.
4 OTP 16 Over-temperature
protection occurs.
SCPI Status Register
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Bit Decimal Value Definition
4-15 Not used 0 Always be 0.
Sending :STATus:QUEStionable:INSTrument:ISUMmary[<n>]:CONDition? will query
the current operation mode (CC or CV) of the corresponding channel. bit0 true
indicates constant current mode; bit1 true indicates constant voltage mode; both bits
true indicates that neither the voltage nor the current is regulated, and both bits false
indicates that the outputs of the power supply are off.
3.2 Standard Event Register
The standard event register reports the following types of instrument events: power-
on detection, command syntax errors, command execution errors, self-test or
calibration errors, query errors, or an operation is complete. Any or all of these events
can be reported to the bit5 (ESB, Event Summary Bit) of the status byte register
through the enable register. To set the enable register mask, you need to write a
decimal value to the register using
*ESE . The definitions of the bits in the standard
event register and the decimal values corresponding to their binary weights are as
shown in the table below.
An error condition (bit2, bit3, bit4, or bit5 of the standard event register) will record
one or more errors in the power supply's error queue. You can
send
:SYSTem:ERRor[:NEXT]? to read the error queue.
Table 3.4 Definitions of the bits in the standard event register and the decimal
values corresponding to their binary weights
Bit Decimal
Value Definition
0 OPC 1 Operation complete. All commands prior to and including the *OPC command have
been executed.
1 Not used 0 Always be 0.
2 QYE 4
Query error. The power supply tried to read
the output buffer but it was empty, or a
new command line was received before a
previous query had been read, or both the
input and output buffers are full.
3 DDE 8 Device error. A self-test or calibration error
occurred.
4 EXE 16
Execution error, including trigger ignore,
initialization ignore, setting conflict, data
overrange, data too long, and invalid
parameter value.
5 CME 32 Command error. A command syntax error
occurred.
SCPI Status Register
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Bit Decimal
Value Definition
6 Not used 0 Always be 0.
7 PON 128 Power-on detection. Power has been turned off and on since the last time the
event register was read or cleared.
3.3 Status Byte Register
The status byte register reports the status information of other status registers. Query
data waiting in the output buffer of the power supply is immediately reported
through the bit4 (MAV, Message Available Bit) of the status byte register. Bits in the
SUMMARY register of the status byte register are not latched. Clearing an event
register will clear the corresponding bits in the status byte SUMMARY register.
Reading all messages in the output buffer, including pending queries, will clear the
bit4 (MAV, Message Available Bit). The definitions of the bits in the status byte
register and the decimal values corresponding to their binary weights are as shown in
the table below.
Table 3.5 Definitions of the bits in the status byte register and the decimal values
corresponding to their binary weights
Bit Decimal
Value Definition
0-1 Not used 0 Always be 0.
2 ERR 4 One or more errors have been stored in the
Error Queue.
3 QUES 8 One or more bits are set in the questionable status register (bits must be
enabled in the enable register).
4 MAV 16 Data is available in the power supply
output buffer.
5 ESB 32 One or more bits are set in the standard event register (bits must be enabled in the
enable register).
6 RQS 64 The power supply is requesting service.
7 OPER 128 One or more bits are set in the operation event register (bits must be enabled in the
enable register).
SCPI Status Register
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